Hi all !

I make Snow falling effect, but it's not good. my particle is falling down is well, but I don't know which way is good for the snow rendering? any tell about this or some examples ……..

thanks guys!

What kind of snow?
Light fluffy drifting flakes where it is close to freezing?
Driving snow storm (blizzard)?
Fine misty snow fall you get on really cold days?
What exactly are you after?

As an Ontarian in Canada, I kinda know snow.

That plate is from “Cloudy With a Chance of Meatballs” and much credit goes to Sony Pictures Imageworks only because my daughter recognized it. I sure didn't (as I have not seen that film) and thought it was your own work as there was no indication. I saw nice snow so was somewhat bewildered by your question. Please give credit where credit is due.

Where is your example file?

Some key ingredients for snow:
- motion blur
- instance geometry for snow flakes vs. sprites with textures
- surface shader that scatters a lot of surface light (roughness set fairly high) with some nice reflective glints if there is a sun or bright light present.
- snow is generally only visible close to the camera in reality but for stylistic reasons you may want to have snow visible far away (influenced by many famous stop-motion films of past where DOF and motion blur is not really a factor). You may want to play with the pscale attribute and increase the scale as particles are further from the camera for stylistic reasons.

Do some searches on the forums, both OdForce and Side Effects for snow.
The Side Effects Exchange has the Weather asset that you might want to look at here:
http://www.sidefx.com/index.php?option=com_wrapper&Itemid=137 [sidefx.com]